Vaisala Humidity and Temperature Meter Series HMT330

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Humidity and Temperature Meter Series HMT330 for Demanding Humidity Measurement


Measure humidity in harsh environments with the instrument you can depend on. The Vaisala HUMICAP® Humidity and Temperature Transmitter Series HMT330 with 10-year warranty* is designed for demanding industrial applications where stable measurements and extensive customization are essential.

Looking for HMT330 performance with interchangeable probes and a transmitter supporting two probes? View Indigo family.

View video on how to replace the HMT330 with the Indigo 520.

There are six models to choose from:

  • HMT331 for wall mounting
  • HMT333 for duct mounting and tight spaces, see also HMP3 and HMP9
  • HMT334 for high pressures up to 100 bar and vacuum conditions, see also HMP4
  • HMT335 for high temperatures, see also HMP5
  • HMT337 for high humidity and meteorological applications, see also HMP7
  • HMT338 for pressurized pipelines up to 40 bar, see also HMP8

The instrument can be quickly tailored to meet the specific needs of each individual application and is pre-configured for each delivery.

  • Full 0 … 100 %RH measurement, temperature range up to +180 °C (+356 °F) depending on model
  • Pressure tolerance up to 100 bar depending on model
  • Excellent performance in harsh conditions; good chemical tolerance
  • Corrosion-resistant IP65/IP66 housing
  • Traceable calibration for measurement and analog outputs (certificates included)
  • RS232/485/422 LAN
  • Modbus protocol support (RTU/ TCP)
  • Optional graphical display and keypad for convenient operation


Key Benefits

Flexible Connectivity
The probe is plug and play compatible with Vaisala Indigo™ series of transmitters, or it can be used as a standalone digital Modbus RTU transmitter over RS-485 serial bus.
Part of Vaisala Indigo™ Product Family
Indigo host devices offer a variety of connectivity options through analog signals or digital outputs, configurable relays, and wireless (WLAN) configuration interface.
Relative Humidity Measurements in High Humidities
When the TMP1 probe is connected to a control system with HMP7, it is possible to have relative humidity measurement in actual process temperature while using probe heating in the relative humidity probe HMP7.

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